Pretty simple answer really:
1) Airdrop ends, no more incentive to post about D.O.
2) Less posts about D.O., less attention it receives
3) Less attention, less buying pressure
4) Less buying pressure -> lower price, assuming selling pressure remains the same
Therefore - Airdrop ends -> Lower price
Yep ! You are totally right in my opinion. I don't want to sound like a hater but I think the price of this coin went up a lot the past few months is because a lot of people are promoting it on Bitcointalk with their signature and not because this coin is amazing or whatever.
I think it's just a shitcoin with a lot of shillers
Oh absolutely! The coin is mostly marketing AFAIK. And that's great if you want a coin with a high price. But if you want a coin that has the potential to last, you need to have the tech to back it up. Again, AFAIK, D.O. does not have this.